If your trailer uses the FIC keys like most, extra keys and more are available direct from the manufacturer (Fastec Industrial) on the net. I have purchased from them and they are a reliable source. They don't charge a whole bunch for shipping, either. When you order, they bill you via PayPal. You do not need a PayPal account to pay either. PayPal offers one time credit card payments which are reliable and secure.
http://www.fastecindustrial.com/products/default.html
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'11 Cougar 326MKS loaded with mods
'12 Ford F250 SuperCab 6.7 PowerStroke Diesel
Amateur Radio: KD2IAT (146.520)
GMRS: WQPG808 (462.675 TPL 141.3)